Last Modified: Oct 01, 2018
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Known Affected Versions:
11.6.0, 11.6.0 HF1, 11.6.0 HF2, 11.6.0 HF3, 11.6.0 HF4
12.0.0, 11.6.0 HF5
Opened: Mar 17, 2015
When Webroot cloud lookup is enabled and the BIG-IP system is under stress load with URLs that cannot be categorized by the local Webroot database managed on the BIG-IP system, the wr_urldbd daemon may return the socket error 'EAI_AGAIN error'. As a result, some of the Webroot cloud lookups are not performed, and relevant URLs are categorized as UNKNOWN. After a large number of cloud lookups, the daemon runs out of sockets. The cloud queries do not go through. URLs get categorized as UNKNOWN.
Due to the socket error under stress load for Webroot cloud lookups relevant URLs could be categorized as UNKNOWN. This only occurs when Webroot cloud lookup enabled. The Webroot cloud lookup features is disabled by default.
If Webroot cloud lookup is enabled while there is heavy traffic with URLs that cannot be categorized by the local Webroot database managed on the BIG-IP system.
This issue has been fixed by releasing sockets properly, so that the wr_urldbd will recover from temporary socket exhaustion.